import { useCallback, useEffect, useState } from 'react'
import { Skeleton } from '@/components/ui'
import { useSession } from '@/lib/auth/auth-client'
import { DEFAULT_TEAM_TIER_COST_LIMIT } from '@/lib/billing/constants'
import { checkEnterprisePlan } from '@/lib/billing/subscriptions/utils'
import { createLogger } from '@/lib/logs/console/logger'
import {
  generateSlug,
  getUsedSeats,
  getUserRole,
  isAdminOrOwner,
} from '@/lib/workspaces/organization'
import {
  MemberInvitationCard,
  NoOrganizationView,
  RemoveMemberDialog,
  TeamMembers,
  TeamSeats,
  TeamSeatsOverview,
} from '@/app/workspace/[workspaceId]/w/components/sidebar/components-new/settings-modal/components/team-management/components'
import {
  useCreateOrganization,
  useInviteMember,
  useOrganization,
  useOrganizationBilling,
  useOrganizationSubscription,
  useOrganizations,
  useRemoveMember,
  useUpdateSeats,
} from '@/hooks/queries/organization'
import { useSubscriptionData } from '@/hooks/queries/subscription'
import { useAdminWorkspaces } from '@/hooks/queries/workspace'

const logger = createLogger('TeamManagement')

export function TeamManagement() {
  const { data: session } = useSession()

  const { data: organizationsData } = useOrganizations()
  const activeOrganization = organizationsData?.activeOrganization
  const billingData = organizationsData?.billingData?.data
  const hasTeamPlan = billingData?.isTeam ?? false
  const hasEnterprisePlan = billingData?.isEnterprise ?? false

  const { data: userSubscriptionData } = useSubscriptionData()

  const {
    data: organization,
    isLoading,
    error: orgError,
  } = useOrganization(activeOrganization?.id || '')

  const {
    data: subscriptionData,
    isLoading: isLoadingSubscription,
    error: subscriptionError,
  } = useOrganizationSubscription(activeOrganization?.id || '')

  const { data: organizationBillingData } = useOrganizationBilling(activeOrganization?.id || '')

  const inviteMutation = useInviteMember()
  const removeMemberMutation = useRemoveMember()
  const updateSeatsMutation = useUpdateSeats()
  const createOrgMutation = useCreateOrganization()

  const [inviteSuccess, setInviteSuccess] = useState(false)

  const [inviteEmail, setInviteEmail] = useState('')
  const [showWorkspaceInvite, setShowWorkspaceInvite] = useState(false)
  const [selectedWorkspaces, setSelectedWorkspaces] = useState<
    Array<{ workspaceId: string; permission: string }>
  >([])
  const [createOrgDialogOpen, setCreateOrgDialogOpen] = useState(false)
  const [removeMemberDialog, setRemoveMemberDialog] = useState<{
    open: boolean
    memberId: string
    memberName: string
    shouldReduceSeats: boolean
    isSelfRemoval?: boolean
  }>({ open: false, memberId: '', memberName: '', shouldReduceSeats: false })
  const [orgName, setOrgName] = useState('')
  const [orgSlug, setOrgSlug] = useState('')
  const [isAddSeatDialogOpen, setIsAddSeatDialogOpen] = useState(false)
  const [newSeatCount, setNewSeatCount] = useState(1)
  const [isUpdatingSeats, setIsUpdatingSeats] = useState(false)

  const { data: adminWorkspaces = [], isLoading: isLoadingWorkspaces } = useAdminWorkspaces(
    session?.user?.id
  )

  const userRole = getUserRole(organization, session?.user?.email)
  const adminOrOwner = isAdminOrOwner(organization, session?.user?.email)
  const usedSeats = getUsedSeats(organization)
  const totalSeats = organizationBillingData?.data?.totalSeats ?? 0

  useEffect(() => {
    if ((hasTeamPlan || hasEnterprisePlan) && session?.user?.name && !orgName) {
      const defaultName = `${session.user.name}'s Team`
      setOrgName(defaultName)
      setOrgSlug(generateSlug(defaultName))
    }
  }, [hasTeamPlan, hasEnterprisePlan, session?.user?.name, orgName])

  const handleOrgNameChange = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
    const newName = e.target.value
    setOrgName(newName)
    setOrgSlug(generateSlug(newName))
  }, [])

  const handleCreateOrganization = useCallback(async () => {
    if (!session?.user || !orgName.trim()) return

    try {
      await createOrgMutation.mutateAsync({
        name: orgName.trim(),
        slug: orgSlug.trim(),
      })

      setCreateOrgDialogOpen(false)
      setOrgName('')
      setOrgSlug('')
    } catch (error) {
      logger.error('Failed to create organization', error)
    }
  }, [orgName, orgSlug, createOrgMutation])

  const handleInviteMember = useCallback(async () => {
    if (!session?.user || !activeOrganization?.id || !inviteEmail.trim()) return

    try {
      const workspaceInvitations =
        selectedWorkspaces.length > 0
          ? selectedWorkspaces.map((w) => ({
              workspaceId: w.workspaceId,
              permission: w.permission as 'admin' | 'write' | 'read',
            }))
          : undefined

      await inviteMutation.mutateAsync({
        email: inviteEmail.trim(),
        orgId: activeOrganization.id,
        workspaceInvitations,
      })

      // Show success state
      setInviteSuccess(true)
      setTimeout(() => setInviteSuccess(false), 3000)

      // Reset form
      setInviteEmail('')
      setSelectedWorkspaces([])
      setShowWorkspaceInvite(false)
    } catch (error) {
      logger.error('Failed to invite member', error)
    }
  }, [session?.user?.id, activeOrganization?.id, inviteEmail, selectedWorkspaces, inviteMutation])

  const handleWorkspaceToggle = useCallback((workspaceId: string, permission: string) => {
    setSelectedWorkspaces((prev) => {
      const exists = prev.find((w) => w.workspaceId === workspaceId)

      if (!permission || permission === '') {
        return prev.filter((w) => w.workspaceId !== workspaceId)
      }

      if (exists) {
        return prev.map((w) => (w.workspaceId === workspaceId ? { ...w, permission } : w))
      }

      return [...prev, { workspaceId, permission }]
    })
  }, [])

  const handleRemoveMember = useCallback(
    async (member: any) => {
      if (!session?.user || !activeOrganization?.id) return

      if (!member.user?.id) {
        logger.error('Member object missing user ID', { member })
        return
      }

      const isLeavingSelf = member.user?.email === session.user.email
      const displayName = isLeavingSelf
        ? 'yourself'
        : member.user?.name || member.user?.email || 'this member'

      setRemoveMemberDialog({
        open: true,
        memberId: member.user.id,
        memberName: displayName,
        shouldReduceSeats: false,
        isSelfRemoval: isLeavingSelf,
      })
    },
    [session?.user, activeOrganization?.id]
  )

  const confirmRemoveMember = useCallback(
    async (shouldReduceSeats = false) => {
      const { memberId } = removeMemberDialog
      if (!session?.user || !activeOrganization?.id || !memberId) return

      try {
        await removeMemberMutation.mutateAsync({
          memberId,
          orgId: activeOrganization?.id,
          shouldReduceSeats,
        })
        setRemoveMemberDialog({
          open: false,
          memberId: '',
          memberName: '',
          shouldReduceSeats: false,
        })
      } catch (error) {
        logger.error('Failed to remove member', error)
      }
    },
    [removeMemberDialog.memberId, session?.user?.id, activeOrganization?.id, removeMemberMutation]
  )

  const handleReduceSeats = useCallback(async () => {
    if (!session?.user || !activeOrganization?.id || !subscriptionData) return
    if (checkEnterprisePlan(subscriptionData)) return

    const currentSeats = subscriptionData.seats || 0
    if (currentSeats <= 1) return

    const { used: totalCount } = usedSeats
    if (totalCount >= currentSeats) return

    try {
      await updateSeatsMutation.mutateAsync({
        orgId: activeOrganization?.id,
        seats: currentSeats - 1,
      })
    } catch (error) {
      logger.error('Failed to reduce seats', error)
    }
  }, [session?.user?.id, activeOrganization?.id, subscriptionData, usedSeats, updateSeatsMutation])

  const handleAddSeatDialog = useCallback(() => {
    if (subscriptionData && !checkEnterprisePlan(subscriptionData)) {
      setNewSeatCount(totalSeats + 1)
      setIsAddSeatDialogOpen(true)
    }
  }, [subscriptionData, totalSeats])

  const confirmAddSeats = useCallback(
    async (selectedSeats?: number) => {
      if (!subscriptionData || !activeOrganization?.id) return

      const seatsToUse = selectedSeats || newSeatCount
      setIsUpdatingSeats(true)

      try {
        await updateSeatsMutation.mutateAsync({
          orgId: activeOrganization?.id,
          seats: seatsToUse,
        })
        setIsAddSeatDialogOpen(false)
      } catch (error) {
        logger.error('Failed to add seats', error)
      } finally {
        setIsUpdatingSeats(false)
      }
    },
    [subscriptionData, activeOrganization?.id, newSeatCount, updateSeatsMutation]
  )

  const confirmTeamUpgrade = useCallback(
    async (seats: number) => {
      if (!session?.user || !activeOrganization?.id) return
      logger.info('Team upgrade requested', { seats, organizationId: activeOrganization?.id })
      alert(`Team upgrade to ${seats} seats - integration needed`)
    },
    [session?.user?.id, activeOrganization?.id]
  )

  const queryError = orgError || subscriptionError
  const errorMessage = queryError instanceof Error ? queryError.message : null
  const displayOrganization = organization || activeOrganization

  if (isLoading && !displayOrganization && !(hasTeamPlan || hasEnterprisePlan)) {
    return (
      <div className='flex h-full flex-col gap-[16px]'>
        {/* Team Seats Overview */}
        <div>
          <div className='rounded-[8px] border bg-[var(--surface-3)] p-4 shadow-xs'>
            <div className='space-y-[12px]'>
              <div className='flex items-center justify-between'>
                <Skeleton className='h-5 w-24' />
                <Skeleton className='h-8 w-20 rounded-[6px]' />
              </div>
              <div className='flex items-center gap-[16px]'>
                <div className='flex flex-col gap-[4px]'>
                  <Skeleton className='h-3 w-16' />
                  <Skeleton className='h-6 w-8' />
                </div>
                <div className='h-8 w-px bg-[var(--border)]' />
                <div className='flex flex-col gap-[4px]'>
                  <Skeleton className='h-3 w-20' />
                  <Skeleton className='h-6 w-8' />
                </div>
                <div className='h-8 w-px bg-[var(--border)]' />
                <div className='flex flex-col gap-[4px]'>
                  <Skeleton className='h-3 w-24' />
                  <Skeleton className='h-6 w-12' />
                </div>
              </div>
            </div>
          </div>
        </div>

        {/* Team Members */}
        <div>
          <Skeleton className='mb-[12px] h-5 w-32' />
          <div className='space-y-[8px]'>
            {[...Array(3)].map((_, i) => (
              <div key={i} className='flex items-center justify-between rounded-[8px] border p-3'>
                <div className='flex items-center gap-[12px]'>
                  <Skeleton className='h-10 w-10 rounded-full' />
                  <div className='space-y-[4px]'>
                    <Skeleton className='h-4 w-32' />
                    <Skeleton className='h-3 w-24' />
                  </div>
                </div>
                <Skeleton className='h-6 w-16 rounded-full' />
              </div>
            ))}
          </div>
        </div>

        {/* Invite Member Card */}
        <div>
          <div className='rounded-[8px] border bg-[var(--surface-3)] p-4'>
            <Skeleton className='mb-[12px] h-5 w-32' />
            <div className='space-y-[12px]'>
              <Skeleton className='h-9 w-full rounded-[8px]' />
              <Skeleton className='h-9 w-full rounded-[8px]' />
            </div>
          </div>
        </div>
      </div>
    )
  }

  if (!displayOrganization) {
    return (
      <NoOrganizationView
        hasTeamPlan={hasTeamPlan}
        hasEnterprisePlan={hasEnterprisePlan}
        orgName={orgName}
        setOrgName={setOrgName}
        orgSlug={orgSlug}
        setOrgSlug={setOrgSlug}
        onOrgNameChange={handleOrgNameChange}
        onCreateOrganization={handleCreateOrganization}
        isCreatingOrg={createOrgMutation.isPending}
        error={errorMessage}
        createOrgDialogOpen={createOrgDialogOpen}
        setCreateOrgDialogOpen={setCreateOrgDialogOpen}
      />
    )
  }

  return (
    <div className='flex h-full flex-col gap-[16px]'>
      {/* Seats Overview - Full Width */}
      {adminOrOwner && (
        <div>
          <TeamSeatsOverview
            subscriptionData={subscriptionData || null}
            isLoadingSubscription={isLoadingSubscription}
            totalSeats={totalSeats}
            usedSeats={usedSeats.used}
            isLoading={isLoading}
            onConfirmTeamUpgrade={confirmTeamUpgrade}
            onReduceSeats={handleReduceSeats}
            onAddSeatDialog={handleAddSeatDialog}
          />
        </div>
      )}

      {/* Action: Invite New Members */}
      {adminOrOwner && (
        <div>
          <MemberInvitationCard
            inviteEmail={inviteEmail}
            setInviteEmail={setInviteEmail}
            isInviting={inviteMutation.isPending}
            showWorkspaceInvite={showWorkspaceInvite}
            setShowWorkspaceInvite={setShowWorkspaceInvite}
            selectedWorkspaces={selectedWorkspaces}
            userWorkspaces={adminWorkspaces}
            onInviteMember={handleInviteMember}
            onLoadUserWorkspaces={async () => {}} // No-op: data is auto-loaded by React Query
            onWorkspaceToggle={handleWorkspaceToggle}
            inviteSuccess={inviteSuccess}
            availableSeats={Math.max(0, totalSeats - usedSeats.used)}
            maxSeats={totalSeats}
            invitationError={inviteMutation.error}
            isLoadingWorkspaces={isLoadingWorkspaces}
          />
        </div>
      )}

      {/* Main Content: Team Members */}
      <div>
        <TeamMembers
          organization={displayOrganization}
          currentUserEmail={session?.user?.email ?? ''}
          isAdminOrOwner={adminOrOwner}
          onRemoveMember={handleRemoveMember}
        />
      </div>

      {/* Additional Info - Subtle and collapsed */}
      <div className='space-y-[12px]'>
        {/* Single Organization Notice */}
        {adminOrOwner && (
          <div className='rounded-[8px] border border-[var(--border-muted)] bg-[var(--surface-3)] p-3'>
            <p className='text-[var(--text-muted)] text-xs'>
              <span className='font-medium'>Note:</span> Users can only be part of one organization
              at a time.
            </p>
          </div>
        )}

        {/* Team Information */}
        <details className='group rounded-[8px] border border-[var(--border-muted)] bg-[var(--surface-3)]'>
          <summary className='flex cursor-pointer items-center justify-between rounded-[8px] p-3 font-medium text-[13px] hover:bg-[var(--surface-4)] group-open:rounded-b-none'>
            <span>Team Information</span>
            <svg
              className='h-4 w-4 transition-transform group-open:rotate-180'
              fill='none'
              viewBox='0 0 24 24'
              stroke='currentColor'
            >
              <path
                strokeLinecap='round'
                strokeLinejoin='round'
                strokeWidth={2}
                d='M19 9l-7 7-7-7'
              />
            </svg>
          </summary>
          <div className='space-y-[8px] border-[var(--border-muted)] border-t p-3 text-xs'>
            <div className='flex justify-between'>
              <span className='text-[var(--text-muted)]'>Team ID:</span>
              <span className='font-mono text-[10px]'>{displayOrganization.id}</span>
            </div>
            <div className='flex justify-between'>
              <span className='text-[var(--text-muted)]'>Created:</span>
              <span>{new Date(displayOrganization.createdAt).toLocaleDateString()}</span>
            </div>
            <div className='flex justify-between'>
              <span className='text-[var(--text-muted)]'>Your Role:</span>
              <span className='font-medium capitalize'>{userRole}</span>
            </div>
          </div>
        </details>

        {/* Team Billing Information (only show for Team Plan, not Enterprise) */}
        {hasTeamPlan && !hasEnterprisePlan && (
          <details className='group rounded-[8px] border border-[var(--border-muted)] bg-[var(--surface-3)]'>
            <summary className='flex cursor-pointer items-center justify-between rounded-[8px] p-3 font-medium text-[13px] hover:bg-[var(--surface-4)] group-open:rounded-b-none'>
              <span>Billing Information</span>
              <svg
                className='h-4 w-4 transition-transform group-open:rotate-180'
                fill='none'
                viewBox='0 0 24 24'
                stroke='currentColor'
              >
                <path
                  strokeLinecap='round'
                  strokeLinejoin='round'
                  strokeWidth={2}
                  d='M19 9l-7 7-7-7'
                />
              </svg>
            </summary>
            <div className='border-[var(--border-muted)] border-t p-3'>
              <ul className='ml-4 list-disc space-y-[8px] text-[var(--text-muted)] text-xs'>
                <li>
                  Your team is billed a minimum of $
                  {(subscriptionData?.seats ?? 0) * DEFAULT_TEAM_TIER_COST_LIMIT}
                  /month for {subscriptionData?.seats ?? 0} licensed seats
                </li>
                <li>All team member usage is pooled together from a shared limit</li>
                <li>
                  When pooled usage exceeds the limit, all members are blocked from using the
                  service
                </li>
                <li>You can increase the usage limit to allow for higher usage</li>
                <li>
                  Any usage beyond the minimum seat cost is billed as overage at the end of the
                  billing period
                </li>
              </ul>
            </div>
          </details>
        )}
      </div>

      <RemoveMemberDialog
        open={removeMemberDialog.open}
        memberName={removeMemberDialog.memberName}
        shouldReduceSeats={removeMemberDialog.shouldReduceSeats}
        isSelfRemoval={removeMemberDialog.isSelfRemoval}
        error={removeMemberMutation.error}
        onOpenChange={(open: boolean) => {
          if (!open) setRemoveMemberDialog({ ...removeMemberDialog, open: false })
        }}
        onShouldReduceSeatsChange={(shouldReduce: boolean) =>
          setRemoveMemberDialog({
            ...removeMemberDialog,
            shouldReduceSeats: shouldReduce,
          })
        }
        onConfirmRemove={confirmRemoveMember}
        onCancel={() =>
          setRemoveMemberDialog({
            open: false,
            memberId: '',
            memberName: '',
            shouldReduceSeats: false,
            isSelfRemoval: false,
          })
        }
      />

      {subscriptionData && !checkEnterprisePlan(subscriptionData) && (
        <TeamSeats
          open={isAddSeatDialogOpen}
          onOpenChange={setIsAddSeatDialogOpen}
          title='Add Team Seats'
          description={`Each seat costs $${DEFAULT_TEAM_TIER_COST_LIMIT}/month and provides $${DEFAULT_TEAM_TIER_COST_LIMIT} in monthly inference credits. Adjust the number of licensed seats for your team.`}
          currentSeats={totalSeats}
          initialSeats={newSeatCount}
          isLoading={isUpdatingSeats}
          error={updateSeatsMutation.error}
          onConfirm={async (selectedSeats: number) => {
            setNewSeatCount(selectedSeats)
            await confirmAddSeats(selectedSeats)
          }}
          confirmButtonText='Update Seats'
          showCostBreakdown={true}
          isCancelledAtPeriodEnd={subscriptionData?.cancelAtPeriodEnd}
        />
      )}
    </div>
  )
}
